Home / 1,394.10-2,091.35-420.28

Finding the Fourth Proportional to 1,394.10, 2,091.35 and 420.28

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Solution

The fourth proportional to 1,394.10, 2,091.35 and 420.28 is: 630.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.10 : 2,091.35 = 420.28 : x
  2. Step 2: Convert to fraction form
    1,394.10/2,091.35 = 420.28/x
  3. Step 3: Cross multiply
    1,394.10x = 2,091.35 × 420.28
  4. Step 4: Simplify right side
    1,394.10x = 878,952.58
  5. Step 5: Solve for x
    x = 878,952.58/1,394.10
  6. Step 6: Final answer
    x = 630.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.